You ask the butcher to grind a sirloin roast to be used for hamburger. You family likes hamburgers rare, so you undercook the meat. Unfortunately, within 2 days they develop the symptoms of gastrointestinal disease: diarrhea, bloating, and vomiting. Which of the following statements best describes what happened?
A. The meat grinder was contaminated, and bacteria were transferred and distributed throughout the meat.
B. The meat became contaminated by bacteria from other foods in your refrigerator.
C. The meat became contaminated by bacteria on the barbeque grill, coating both sides of the hamburger patties.
D. The animal was sick before slaughter, and the sirloin was contaminated.
Answer: A
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Which one of the following is the external structure of the ear that enhances reception of sound waves?
A. tympanic membrane B. oval window C. cochlea D. pinna
Answer the following statements true (T) or false (F)
1. All human warts are caused by viruses in the genus Papillomavirus. 2. Chickenpox and shingles are caused by the same virus. 3. Koplik spots are a sign of smallpox. 4. Mumps is a rather mild disease, without any serious complications. 5. West Nile virus is most commonly transmitted by tick bite.
Anaphase
a. involves the lining up of the chromosomes across the equatorial plate. b. is the same in mitosis and meiosis I and II. c. is initiated when the chromosomes begin to move apart. d. results in an unequal distribution of chromosomes to the resulting cells. e. occurs after telophase.
Butter, which is made from milk fat, tends to be harder at room temperature than most margarines. If you wanted to make a butter that is softer at room temperature, you should consider:
A) adding more than three fatty acid chains to the triglycerides. B) saturating the fatty acid chains. C) making the fatty acid chains longer. D) making fatty acid chains with fewer kinks. E) creating more double bonds in the fatty acid chains.